There are two parts to the dungeon under White Wolf Mountain. The main part is the shortcut from Taverley to Catherby. This allows players a much faster and safer route than going over the mountain. The mountain dwarves are a good location for lower level players to train on as they are fairly close to a bank. Another feature of the Dwarven passage, is an entrance to the Dwarven city of Keldagrim. Buy a cart pass from the Dwarven Conductor and off you go to Keldagrim.
The second part of the dungeon, is the ice passages. These passages are used for the Heroes Quest and are a good training spot for players who wish to train on ice warriors and giants. The entrance to the ice passages are on top of White Wolf Mountain.

Ice Giant (Level 53) Ice Queen (Level 111) Ice Spider (Level 61) Ice Warrior (Level 57) Mountain Dwarf (Level 20)